If an HTTP server returns an error code (such as no such url) but also includes
a content length in the reply, the FileNotFound exception gets eaten. This leads
to some bogus actions down the line, such as trying to parse the error
response from the server as a valid class file or preventing HotJava from putting
up its normal 'file not found' exception page.

A server that does this is CERN/3.0pre3 (running on wombat),
CERN/3.0pre6 (running on sunweb.ebay), or Netscape-Communications/1.1
(running on www.netscape.com).

To reproduce, just visit any invalid URL in HotJava. The server on cafedead
(NCSA/1.0) doesn't include content-length on its error returns, so it can be
used for comparison.

[a 21 Jul 96]